1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bba8ce49b3d4be590cfc4d464d45bf88abfcd059ffc33d12065c9015ae3d21. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab4a3a08-69d7-4b02-b328-7a0d681cd48c.json and https://artists.proofprofile.net/proofs/artist/ab4a3a08-69d7-4b02-b328-7a0d681cd48c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e7ce074b556ec66330c14d0c669921776fce0871779619acc4b0ee4bbe8fb4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1841647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52392c07c4f075cbbc6c14c100b6da22f6836b8ab3387e0707c8cc14a601f82e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1859426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461ca20a0416a72df0dd5904ed2859258efa74cc121f2afaf182898d6ebf9fa7. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES71G1621589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01084f4f46ef48911f9df1c0b432c20c1994360d7046d8f5f77f1c9d6f9f8f98. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES21A1100121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded3435f9d929fbbec78bd6934703c1f48f339bb0a505f157eb376d80126ca5f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES21A1100124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c21d1a416a28915de5c43add7a094f539c8ad166f17cc3f9c2afaf84c83504. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES21A0900146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb57183cdcd224df04e096cdc8a0154dfaac83f787aa6ec8f8b03c05b0d0532d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES21A0900152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8917b28183208a3a1d2b1b74ad0af8f9c4ec699fe042f53a28d4ec9365b3cb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590700061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eecd3642cb9e7ca7568232c3e2f59b9c216fd2946e68b225ea394fd2d06a715. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590700063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c368c8e6453e5805780ecf3d4076ee645811df9afa6f79c7a1b1e18df05714. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590700065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45532b689cc0844af81a19f91b891b9bed895fbea1578f43e4fb66d225a1a1a. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5591101729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e0df94783355f9587be5647c593df471dd5b20d7e538afb9174b96ea9fc14f. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590500392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c05cee8d8208fde9df8818d46987893d9723b859192d84e3531dfc4311bca3. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590700481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50245007ac8f4bec87500bfd35fc283dad661d59e0c6c65b0a585c53535ad32. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590400096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0627f9b5326bf7c86507622042e0940da3d6328508bcee76c28cdb1253e04af3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590601963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c3132d17551a708a71dc365b011462b32d3840b1273b49f927a5e63a63a9f3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590602210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bc5fe6f90c159fb224694baa5ae904598e3f81b50a0e07af782cdef482b2b3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590602149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8917b28183208a3a1d2b1b74ad0af8f9c4ec699fe042f53a28d4ec9365b3cb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590700061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33a2151412c2d9b8411b080e576bff1047444b08b6bfe2f7a448ba60e38461a. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5591400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369b0526d6598040a3693f2fddb6e0ecad14a6cff687b396ef797496293a0c7d. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5591100260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e53e23a21c90a40757debdd03d404dc075a1df07e9ad12d90c62a9ab14d203d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5591100660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc34dce601ece1ced4d819270b239e7b759841ed79a70c906fd81f87f30b50e0. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5590602543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7cf7b19f9178958c4be162276a0852dd80c2a52caa3e2b592d46226baa02c7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5591400096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e5e2bcf9b67a4c1b7eab837460f81bc7393169223938ac3b4249394c9394ee. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5592200482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b330e536839285f0f86dcb4f8fb9ac8e6d675acc5307cc6df9be498bcfc9461. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5592200490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0a8941b7279a30a312092fe67e333da0e6314fa179f1fa08bc0438400865c3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5592200492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4343a1f4ec275238e3f1f4c4b39da7338172ae0f3ec4cb124f487b267d89d7ff. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5592200496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815d7742cee0ac309a75a7d3efaf0f17081b64583cb102bd893f9b2e55b1f555. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5592200502.